Air brake stroke length indicator



FIG. 1 is a front elevational view of an air brake stroke length indicator showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image;

FIG. 4 is a bottom plan thereof; and,

FIG. 5 is a sectional view thereof taken on line 5--5 of FIG. 1. 

The ornamental design for an air brake stroke length indicator, as shown and described. 